Abstract
In electronic design problems, the efficient power transfer and amplification between some source and a specific load are taken into consideration. The signal flow path traverses several passive and active elements such as impedance transformers, filters, and amplifiers. With transistors as the active elements and at power levels of the order of 10W, there are uncomfortably low input and output impedances. It is well known that the application of negative feedback can profoundly modify the gain, linearity, and the terminal impedances of an amplifier. This chapter discusses the compact and elegant matrix methods of analysis and design of a three-stage transistor power amplifier. It presents a three-stage model constructed using the single-stage non-feedback amplifier as a building block. The approximate gain and terminal conditions of this elementary unilateral model is related to the h and Z twoport parameters.
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